Bosch LBB 1968 Manual de usuario descargar pdf (Pagina 7)

34 | Plena Range

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Communication

LBB 1925/10 Plena System Pre-

Amplifier

The Plena system pre-amplifier is a high-performance, versatile

call and BGM (background music) mono pre-amplifier, capable

of fulfilling a wide variety of public address requirements.

It provides dual channel operation for calls and BGM

simultaneously for up to a maximum of six different zones, using

two Plena booster amplifiers. In addition, single channel

operation is possible with only one Plena Amplifier.

Features

• 6-zone system pre-amplifier, with single or dual channel

operation

• Two inputs for call stations

• Universal input for microphone/line, with speech optimized

tone control

• Three inputs for BGM selection and music optimized tone

control

• Front panel zone selection for BGM and call station zone

selection for calls

• PC and trigger inputs for automated calls, alarm tones and

chimes to selected zones.

Functions

The call channel provides two inputs for Plena call stations,

LBB 1941/00 (all-call) or LBB 1946/00 (6-zone), with loop-

through capability, and a universal balanced input, having the

choice of a 3-pin XLR connector for microphone or line level

(selectable), or a 5-pin DIN-connector with all-call priority

contact, which may also start one of the available chime

attention signals.

The microphone input has a selectable speech filter for improved

intelligibility, a volume control, and bass and treble tone controls

with shelving characteristics optimized for speech. The call

channel is available on the balanced XLR master output.

The BGM channel provides three inputs on stereo Cinch-

connectors, converted to mono, with front panel selection,

volume control and bass and treble tone controls with shelving

characteristics optimized for music. The BGM channel has a

direct output on balanced XLR for dual channel operation. It can

also feed the master output, with the lowest priority, for single

channel operation. The routing of BGM can be selected by

means of zone selector switches on the front panel.

An emergency/telephone input with signal level detector (VOX)

and rear volume preset may detect an audio signal and has the

highest priority to all zones. Two trigger inputs (contact closure)

control alarm or time signals to selectable zones. Many different

chine tones are available for selection. Furthermore, a PC audio

input with RS-232 control has been provided for PC control of

zones or automatic messaging in combination with the Plena

message manager.

There are six levels of priority available for BGM, microphone,

call stations, trigger inputs and emergency input.

The LBB1925/10 has a set of relays for zone-switching the

power amplifier output(s) to different loudspeaker groups.

Each of the zones can be switched between the call channel

(upon call-station selection or all-call microphone or emergency

activation), the BGM channel (upon front panel selection), or off.

In order to get a message through (although the local volume

controls may be set to a low volume level for e.g. background

music), override relay contacts are provided for each zone to

separately override local loudspeaker volume controls. Both the

3-wire and 4-wire override schemes are supported. Upon a call

or an activated trigger input these contacts will be activated for

the appropriate zones, together with an additional voltage-free

contact (Call Active) for control purposes.

Parts Included

Certifications and Approvals

Installation/Configuration Notes

A 24 VDC output is available to supply power to external relays,

so no external power supply is required. A headphone connector

and LED VU-meter allows for monitoring of the master output.

Quantity Component

1 LBB 1925/10 PLENA System Pre-amplifier

1 Power cord

1Plena CD

1 19”mounting brackets

EMC emission acc. to EN 55103-1

EMC immunity acc. to EN 55103-2

1 2 3 4 5 6 7 8 9 10 11 12 ... 25 26

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Bosch LBB 1968 Manual de usuario Pagina 7

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